Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Net Changes In Components of Operating Assets and Liabilities

The following table provides information regarding the net changes in components of operating assets and liabilities.

	Three Months Ended March 31,
	2021		2020
(Increase) decrease in:
Accounts receivable	$	(99,504)	$	101,405
Inventories	27,450		(5,024)
Deferred charges	7,731		2,783
Other current assets	(2,294)		(3,746)
Increase (decrease) in:
Accounts payable	38,994		(62,365)
Accrued liabilities	22,561		(25,519)
Net changes in components of operating assets and liabilities	$	(5,062)	$	7,534